Bosch GCL 2-55 Operating/Safety Instructions Manual page 28

– Switch the measuring tool on and allow it to level.
– Mark the center of the upper crossing point on the ceiling (point I).
Also mark the center of the bottom laser point on the floor (point II).
– Rotate the measuring tool 180°. Position it so that the center of the
lower laser point is on the point II which has already been marked.
Allow the measuring tool to level.
Mark the center of the upper laser point (point III).
16 ft
(5 m)
d
180°
-28-